Condenser for ignition apparatus



May 20, 19 24. 1,494,744

E. HURLiMANN ET AL CONDENSER FOR IGNITION APPARATUS Filed Oct. 18 1919 FBYJZZQW,

JBOZ/ZZ Patent d May 1924.

UNITED STATES PATENT OFFICE.

mar HUBLIIAIH, OI zpcnwn, sommnn, FEEDER-1C DILLON, OI BOLOTHUBN,

ARI) J'AOQUIS DOHLI, 0.! SQIDTKUBR, OBAGK, SWITZERLAND, ASSIGNOBS TO THE rm scnrrmu, OI SOLOTHUEI', SWITZERLAND.

CONTJIISKB IOB IGNITION APPARATUS.

' Application fled October 1., 1019. Serial Io. 881,788.

To all whom it may concern:

Be it known that we, En s'r HURLIMANN, a citizen of the Swiss Republic, residing at Zuchwil, Solothurn, Switzerland, FREDERIC 6 BILLON, a citizen of'the Swiss Republic, re-

siding at Solothurn, Switzerland, and JACQUES BOHLI, a citizen of the Swiss Rep ublic, residing at Solothurn, Obach, Switzerland, have invented certain new and use- 1 ful Improvements in Condensers for Ignition Apparatus Used .in Conjunction with Explosion Motors, of which the following is a specification.

TlllS invention relates to an improved 16 condenser for ignition apparatus of explosion motors.

The generation of the ignition voltage at the spark plugs of explosion motors is generall effected by the method of connection whic is diagrammatically illustrated in Fig. 1. Alternating or pulsating current i electromagnetically' produced? in the primary coil a, which current is alternately v closed over the interrupter b and the condenser o. The rima current impulses,

which are strengt ened y the condenser, induce into the secondar winding d voltage impulses which are su$cientl strong even in the case of low motor speed; to allow the 80 ignition spark to jump over between the electrodes e of the spark plug. It is customary to place the condenser 1n the casing of the i, 'tion machine, which casin however, -as to be kept as smallas possl le-'.-.;

86 This is attained according to the invention in that the outer shape of the condenser is made to correspond to the form of the ignition' coil.

Various forms of constructi l e or. carrying the invention into effect arc -illustrated by' way of exam le, in the accompanying drawings in whic Figure 1 represents diagrammatically a common arrangement of circuits in an ignition device. Figure 2 .tion coil and itscondenser.

represents a cross-sectional view of an igni- Figure 3 1s a sectional elevation of an ignition coilwith the condenser wound between the primary and secondar windings, and Fi re -4 a cross-sectiona view of the coil i ustrated in Fi re 3.

Re erring to Fig. 2, the xmdenser c is bent in the shape of a cylindrical segment corresponding to the form of the coil, and is placed around a portion of the outer surface of the coil f. The condenser is held by means ofmetal bands 9 against the two cross mem rs h, which are secured between the insulating flangesi of the coil f.

Referring to Figs. 3 and 4, the condenser c is bent cylindrically correspondin to the form of the coil, but is arranged tween the primary winding a and secondary winding d and placed in several layers round the primary coil a. Similarly the condenser ma be wound outside around the secondary coi d or entirely inside around the iron core k. Sometimes it is suflicient to construct the condenser as a cylindrical condenser, that is with concentric and closed condenser coatii 'h at we claim is 1. An ignition 0011 including a core, a r1- mary and a secondary winding surroun ing said core and a condenser, whose surface is in contact with the inner surface of one of said windings and conforms in shape thereto, surrounding said core.

2. An ignition coil comprising a cylindrical core, a coil surrounding said. core, a condenser surrounding said coil and an outer coil surrounding said condenser.

In testimony whereof they have signed their names to this specification.

' ERNST HURLIMANN.

FREDERIC BILLON. JACQUES BoHLI. 

